Responses
Yes I wish he'd driven him to rehab rather than dump him on the street.
Rehab isn’t free. Plus Shin is literally only barely surviving himself. Gren did this to himself, he isn’t a kid anymore and kept talking about wanting to change but he doesn’t do anything about his situation in retrospect. As painful it was for Shin to free himself from the shell of a person he once knew he had to do it before he dragged him down too.（￣へ￣）
I would've provided Gren at least a safe hiding location and made him promise to get himself clean, not throw him away like a dog on a curbside. That's just sad, Gren needs his help the most during that time especially being a drug addict, he will really need someone's assistance.